The Company accounts for asset retirement obligations as determined by
SFAS No. 143, Accounting for Asset Retirement Obligations, (SFAS No. 143) and FASB Interpretation No. 47, Accounting for Conditional Asset Retirement Obligations, an interpretation of
FASB Statement No. 143, (FIN No. 47). SFAS No. 143 and FIN No. 47 address financial accounting and reporting for legal obligations associated with the retirement of tangible long-lived assets
and the related asset retirement costs. SFAS No. 143 requires that companies recognize the fair value of a liability for an asset retirement obligation in the period in which it is incurred. When the liability is initially recorded, the
entity capitalizes a cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the estimated useful life of the related
asset. Upon settlement of the liability, an entity either settles the obligation for its recorded amount or incurs a gain or loss upon settlement.

F-12

MetroPCS Communications, Inc. and Subsidiaries

Notes to Consolidated Financial Statements

December 31, 2008, 2007 and 2006

The Company is subject to asset retirement obligations associated with its cell site operating
leases, which are subject to the provisions of SFAS No. 143 and FIN No. 47. Cell site lease agreements may contain clauses requiring restoration of the leased site at the end of the lease term to its original condition, creating
an asset retirement obligation. This liability is classified under other long-term liabilities. Landlords may choose not to exercise these rights as cell sites are considered useful improvements. In addition to cell site operating leases, the
Company has leases related to switch site, retail, and administrative locations subject to the provisions of SFAS No. 143 and FIN No. 47.

In June 2001, the FASB issued SFAS No. 143,
Accounting for Asset Retirement Obligations (SFAS No. 143). This statement provides accounting and reporting standards for costs associated with the retirement of long-lived assets. This statement requires
entities to record the fair value of a liability for an asset retirement obligation in the period in which it is incurred. When the liability is initially recorded, the entity capitalizes a cost by increasing the carrying amount of the related
long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the estimated useful life of the related asset. Upon settlement of the liability, an entity either settles the
obligation for its recorded amount or incurs a gain or loss upon settlement. The Company adopted SFAS No. 143 on January 1, 2003.

The Company is subject to asset retirement obligations associated with its cell site operating leases, which are subject to the provisions of SFAS No. 143. Cell site lease agreements may contain clauses requiring restoration of the
leased site at the end of the lease term to its original condition, creating an asset retirement obligation. This liability is classified under other long-term liabilities. Landlords may choose not to exercise these rights as cell sites are
considered useful improvements. In addition to cell site operating leases, the Company has leases related to switch site, retail, and administrative locations subject to the provisions of SFAS No. 143.

The adoption of SFAS No. 143 resulted in a January 1, 2003 adjustment to record a $0.7 million increase in the carrying values of property and
equipment with a corresponding increase in other long-term liabilities. In addition, $0.1 million of accretion, before taxes, was recorded to increase the liability to $0.8 million at adoption. The net effect was to record a loss of approximately
$0.1 million as a cumulative effect adjustment resulting from a change in accounting principle in the Companys consolidated statements of income upon adoption on January 1, 2003.

The following pro forma data summarizes the Companys net income as if the Company had adopted the provisions of SFAS No. 143 on
January 1, 2002, including an associated pro forma asset retirement obligation on that date of $0.5 million (in thousands):